Further to this.....and not to minimize mass surveillance which I find repugnant.....for most people the countermeasures required to protect themselves from spying is just too inconvenient to make it worthwhile. Most people really don't have anything that important to hide. It will be a plus if developers make it easier for everyone to protect themselves going forward.
But what matters now is that the small percentage of people who really do need to keep secrets from government are now taking measures to do so. If that is the effect of Snowden's revelations then it has been worthwhile, but the metrics in the article will never show that. It's not like those people are going to tell you they have changed their behavior.
Government thinks that you should be able to keep secrets from anybody but them, but history shows it is the government people most need to be able to keep secrets from. It's good that people fully know what they are up against.
And for those who say "but what about the scary terrorists!?" - I say I would rather live in a free country with a risk of terrorism than an ostensibly "safe" police state.
I'm not American, but Benny had it right; "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." - Ben Franklin.